Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 166, NWS Norman, OK

May 20, 20104 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 20, 2010, 1:55 AM CDT for 4 counties in Oklahoma. It was in force for 50 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: May 20, 2010, 1:55 AM CDT (06:55 UTC)
Expired: May 20, 2010, 2:45 AM CDT
In force: 50 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Coal County, OK, Hughes County, OK, Pontotoc County, OK, Seminole County, OK

The radar

The Norman radar (KTLX), 90 km from the middle of the area, began a volume at 06:55 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 19, 9:35 PM CDT	Tornado Watch	SPC	4 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 6.9 hours before the alert went out and 93 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1598 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 954 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 259 m²/s²
0-3 km storm-relative helicity: 410 m²/s²
Significant tornado parameter: 2.8
Supercell composite: 18.7

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Norman, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at May 19, 11:59 PM CDT, 1 hour 56 minutes earlier.

Area forecast discussion, May 19, 11:59 PM CDT, 1 hour 56 minutes before

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Hazardous weather outlook, May 20, 12:20 AM CDT, 1 hour 35 minutes before

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In the hours before

Local storm report, May 19, 11:18 PM CDT, 2 hours 37 minutes before

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Local storm report, May 19, 11:20 PM CDT, 2 hours 35 minutes before

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Special weather statement, May 19, 11:29 PM CDT, 2 hours 26 minutes before

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Special weather statement, May 20, 12:50 AM CDT, 1 hour 5 minutes before

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Special weather statement, May 20, 1:15 AM CDT, 40 minutes before

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Special weather statement, May 20, 1:48 AM CDT, 7 minutes before

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The office that day

Everything else NWS Norman, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 19, 7:02 PM CDT	Severe Thunderstorm Warning	OUN	Harper, Woods, Woodward	58 min
May 19, 7:08 PM CDT	Tornado Warning	OUN	Lincoln, Oklahoma, Pottawatomie	52 min
May 19, 7:26 PM CDT	Tornado Warning	OUN	Garvin, Stephens	49 min
May 19, 7:29 PM CDT	Severe Thunderstorm Warning	OUN	Payne	61 min
May 19, 7:32 PM CDT	Tornado Warning	OUN	Cleveland, McClain, Pottawatomie	43 min
May 19, 7:42 PM CDT	Tornado Warning	OUN	Lincoln	42 min
May 19, 7:45 PM CDT	Severe Thunderstorm Warning	OUN	Logan	45 min
May 19, 7:45 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Pottawatomie, Seminole	45 min
May 19, 7:53 PM CDT	Severe Thunderstorm Warning	OUN	Major, Woods, Woodward	67 min
May 19, 8:11 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, Murray	64 min
May 19, 8:15 PM CDT	Severe Thunderstorm Warning	OUN	Pottawatomie, Seminole	45 min
May 19, 8:15 PM CDT	Tornado Warning	OUN	Lincoln	30 min
May 19, 8:17 PM CDT	Areal Flood Advisory	OUN	Lincoln, Logan, Payne	3 hr
May 19, 8:29 PM CDT	Severe Thunderstorm Warning	OUN	Pottawatomie, Seminole	46 min
May 19, 8:33 PM CDT	Tornado Warning	OUN	Garvin, Murray, Pontotoc	42 min
May 19, 8:59 PM CDT	Severe Thunderstorm Warning	OUN	Hughes, Pottawatomie, Seminole	61 min
May 19, 9:10 PM CDT	Tornado Warning	OUN	Garvin, Murray, Pontotoc	65 min
May 19, 10:04 PM CDT	Severe Thunderstorm Warning	OUN	Hughes, Lincoln, Pottawatomie, Seminole	56 min
May 19, 10:07 PM CDT	Severe Thunderstorm Warning	OUN	Coal, Hughes, Pontotoc	53 min
May 19, 10:56 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Coal, Hughes, Pontotoc	64 min
May 19, 11:51 PM CDT	Areal Flood Advisory	OUN	Pottawatomie, Seminole	3 hr
May 19, 11:59 PM CDT	Severe Thunderstorm Warning	OUN	Atoka	46 min
May 20, 12:02 AM CDT	Severe Thunderstorm Warning	OUN	McClain, Pottawatomie, Seminole	43 min
May 20, 1:33 AM CDT	Dense Fog Advisory	OUN	Alfalfa, Blaine, Caddo, Canadian, Cleveland, Garfield and 13 more	6 hr
May 20, 1:41 AM CDT	Severe Thunderstorm Warning	OUN	Hughes	49 min
May 20, 2:45 AM CDT	Severe Thunderstorm Warning	OUN	Atoka, Coal, Pontotoc	60 min
May 20, 2:53 AM CDT	Severe Thunderstorm Warning	OUN	Atoka	67 min
May 20, 3:18 AM CDT	Areal Flood Advisory	OUN	Atoka, Coal, Hughes, Pontotoc	3 hr
May 20, 3:53 AM CDT	Areal Flood Warning	OUN	Coal, Hughes, Pontotoc	6 hr
May 20, 4:18 AM CDT	Areal Flood Advisory	OUN	Johnston, Murray, Pontotoc	3 hr
May 20, 4:25 AM CDT	Severe Thunderstorm Warning	OUN	Atoka, Coal, Johnston, Murray, Pontotoc	65 min
May 20, 5:44 AM CDT	Areal Flood Advisory	OUN	Atoka, Johnston	3 hr
May 20, 6:37 AM CDT	Areal Flood Advisory	OUN	Atoka	113 min
May 20, 8:47 AM CDT	Areal Flood Warning	OUN	Atoka, Bryan, Johnston	6 hr
May 20, 10:04 AM CDT	River Flood Warning	OUN	Atoka, Bryan	71 hr
May 20, 2:17 PM CDT	River Flood Warning	OUN	Logan, Payne	14 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2010 Every severe thunderstorm warning in 2010

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.